Members of Ardrossan Castle Heritage Society and volunteers helped Dr Oliver
O'Grady, shown above, conduct a ground penetration radar survey on the Castle
Hill. This involved creating a grid of twenty metre squares which were surveyed
using a Fluxgate Gradiometer.

Castle Hill is known locally as Cannon Hill. This is because four or five
cannons, pointing towards the sea, stood on the hill for about three hundred
years until they were removed to reuse their metal in the 1939-45 war.